447 



of which was only £3 15s., and this was also the first lens of this 

 kind which had been made for a long tube. Semi-apochromatic 

 lenses had been greatly improved, and there was now very little 

 to choose between them and the apochromatics. The difference 

 between them in aperture being in the proportion of 13 to 14, 

 many of the more difficult test objects could be resolved by them 

 with a little care. He also called attention to some photographs, 

 framed and exhibited on the table. All had been enlarged to the 

 same size of picture, although the magnifying powers under 

 which the original negatives were taken varied considerably. 

 He thought, notwithstanding the great amount of amplification 

 that many of these pictures would be found remarkably sharp and 

 well defined. He also exhibited one of his new mirror loups. 

 which he thought was likely to be found serviceable either in 

 daylight or by the light of a paraffin lamp. He had shown a 

 lens made on the same formula before, but this one had the 

 mirror added. 



The thanks of the meeting were unanimously voted to Mr. 

 Nelson for his exhibits and the interesting descriptions given. 



The proceedings then terminated with the usual conversazione. 



The eggs of Hemerophila abruptaria Mr. A. W. Dennis. 



Foraminif era from south-west of Ireland . . . Mr. A. Earland. 



The embryos of Planorbis ... ... ... Mr. A. E. Hilton. 



Procdes ivernecki (male and female) . . . Mr. C. F. Rousselet. 



Cynips longipennis ... ... ... ... Mr. C. Turner. 



July 2nd, 1897. — Conversational Meeting. 



Rotifers inside Volvox ... ... ... Mr. W. Goodwin. 



The eye of Aphrojjhora spumaria ... ... Mr. A. E. Hilton. 



Sponge spicules from Oamaru ... ... Mr. A. J. Jenkins, 



Markings on the halteres of the blow-fly . . . Brigade-Surgeon 



J. B. Scriven. 



Isthmia enervis growing on Algae ... ... Mr. 0. Sidwell. 



The head of Ocypus olens ... ... . . Mr. C. Turner. 



